undo getter changes

src/main/java/org/cryptomator/ui/mainwindow/MainWindowTitleController.java

@@ -131,7 +131,7 @@ public class MainWindowTitleController implements FxController {
 	}
 
 	public boolean isUpdateAvailable() {
-		return updateAvailable.getValue();
+		return updateAvailable.get();
 	}
 
 	public boolean isTrayIconPresent() {

src/main/java/org/cryptomator/ui/preferences/UpdatesPreferencesController.java

@@ -168,7 +168,7 @@ public class UpdatesPreferencesController implements FxController {
 	}
 
 	public boolean isUpdateAvailable() {
-		return updateAvailable.getValue();
+		return updateAvailable.get();
 	}
 
 	public BooleanBinding checkFailedProperty() {